"In terms of otherworldly beauty, it’s hard to beat this cerulean lake in the shadows of four Sierra Nevada peaks: Mount Russell, Mount Carillon, Tunnabora, and the Cleaver. Because of its high elevation and imposing scenery, Tulainyo often remains partially frozen even during the warmer months. It’s worth embarking on the trek in the peak of summer, when the lake is at its bluest, most shimmering state."